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A card starting with a 4 is a Visa , with a 5 is a Mastercard ,
with a 3 (15 digits long) is an Amex , with a 6 is Didcover/JCB. Some sites might ask for a CVV2 , this is the tree digit verification code on the back of the card. Mostly this is also pasted on the forum or mIRC channel. Note : Amex has a 4 digit verification code , and for discover 000 can be used.